单项选择题

They ________ the park of late.

A．will visit
B．have visited
C．are visiting
D．visited
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单项选择题
In selecting a material, the engineer’s interest is in its properties which determine how it will perform under the loads and condition ________ it is subject.
A．where
B．which
C．in which
D．to which
单项选择题
The president made a brilliant decision, didn't he Yes, he did. I don't know what I would have done if I ________ to make that decision.
A．were
B．had had
C．have had
D．had
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